<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
    <div class="content">
        <h1 class='h1'>一级标题</h1>
        <b>加粗</b>
        <p>段落</p>
        <span>内容</span>
        <a id='link' href='www.google.com' class='link'>link</a>
        <a id='back' href='www.baidu.com'>back</a>
    </div>
</body>
</html>